GDS ELECTRO-MECHANICAL DYNAMIC CYCLIC SIMPLE SHEAR

Product Code : EMDCSS

The GDS Electromechanical Dynamic Cyclic Simple Shear Device (EMDCSS) is for simple shear testing, which can be upgraded to direct shear. It is capable of carrying out dynamic cyclic tests from small strain (0.005% shear strain amplitude) to large strain (10% shear strain amplitude), as well as extremely accurate quasi-static testing. This is the choice for a no-compromise simple shear machine with the greatest range of testing capability. The perfect choice for advanced commercial testing or academic research.

Dimensions	1200mm (H) x 500mm (L) X 770mm
Displacement Range	axial = +/- 25mm, shear = +/- 15mm: Accuracy = <0.1% FSO (In practice, axial range is +/-50mm to aid sample placement, however measured stroke is +/- 25mm, and shear stroke is supplied as standard with a high accuracy +/-10mm LVDT).
Displacement Resolution	16 bit (i.e. +/- 20mm = 0.6μm, +/- 15mm = +/- 0.5μm, +/- 2.5mm = <0.1μm)
Load Range (kN)	5, 10
Operating Frequency (Hz)	0 to 5Hz
Power	240V or 110V 50/60Hz 1 ph
Sample Sizes	50, 70, 100mm, custom
Weight Approx (kg)	160

To see a comparison table of selected GDS shear products, click on the link, shear products comparison.

Features & Benefits:

A cylindrical soil specimen is laterally confined by Teflon coated low friction retaining rings, ensuring a constant cross sectional area.
Vertical displacement can be prevented, therefore constant volume conditions are enforced (i.e Simple Shear).
The ability to simulate principle stress rotation is common to many geotechnical problems, including earthquake loading.
Teflon coated, low friction constraining rings used to maintain k-zero conditions.
High quality, low friction linear guides used to ensure strength and alignment in normal and shear directions.
Static/monotonic tests with no minimum rate.
Complies to ASTM D6528 and in accordance with NGI testing procedures.
Electro-mechanical actuators that give superior performance when compared to pneumatic equivalents, meaning full amplitude tests (up to +/-1mm) can be carried out at 5Hz.
Mains power supply means no external noisy power pack is required. System draws only the power that is required.
Direct closed loop of axial force means accurate testing with no user tuning / intervention during a test.
Direct closed loop of Normal and Shear displacement allows accurate testing with no user tuning / intervention required during a test.
Independent control of axial axis and cell pressure axis allows tests such as out of phase loadings.
Pre-programmed sine, havesine, triangular and square waveforms provides ease of use for standard tests.
Axial linear guidance provided by super-stiff crossed-roller bearings. 200mm bearing length to provide stability. Ensures minimal rotation of the topcap during shearing. Allowing testing to be simple shear rather than rotational motion.
Shear linear guidance provided by super-stiff crossed-roller bearings. 200mm bearing length to provide stability. High load capacity with low friction and accurate linear guidance.
Stiff frame construction including 2 off 38mm anti-compliance bars to maintain system rigidity.

Key features	Benefits to the user
Teflon coated low friction retaining rings:	A cylindrical soil specimen is laterally confined by teflon coated low friction retaining rings, ensuring a constant cross sectional area (or K-zero conditions).
Electro-mechanical actuators that give superior performance, reduce space and provide cost savings:	Electro-mechanical actuators can carry out tests up to +/-1mm at 5Hz, with greater accuracies than comparable pneumatic actuators. Mains powered means no external noisy power pack is required and as opposed to pneumatic systems electro-mechanical systems draw only the power that is required.
Active height control:	Therefore constant volume conditions are enforced i.e Simple Shear. No manual intervention between stages plus little or no effects of vertical compliance.
Axial & Shear linear guidance provided by super-stiff crossed-roller bearings:	200mm bearing length not only provides stability while ensuring minimal rotation of the topcap during shearing, allowing testing to be simple shear rather than rotational motion, but also provides high load capacity with low friction with accurate linear guidance.
GDS shear loadcell:	Designed so that shear force is measured in front of the linear guides, as such the shear force measurement does not include frictional errors.

EMDCSS SAMPLE PREPARATION VIDEO

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GDS ELECTRO-MECHANICAL DYNAMIC CYCLIC SIMPLE SHEAR